<template>
  <div class="login_container">
    <div class="login_box">
      <!--头像-->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="">
      </div>
      <!--登录表单区域-->
      <el-form ref="loginFormRef" label-width="0px" :model="loginForm" :rules="loginFormRules" class="login_form">
       <!--输入框-->
        <el-form-item prop="username" >
          <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
        </el-form-item>
        <el-form-item prop="password" >
          <el-input type="password" v-model="loginForm.password" prefix-icon="iconfont icon-3702mima"></el-input>
        </el-form-item>
        <!--按钮-->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登陆</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 这是登陆表单的数据绑定对象
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      /* 这是表单验证规则对象 */
      loginFormRules: {
        /* 验证用户名是否合法 */
        username: [
          { required: true, message: '请输入登陆名称', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入登陆密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
   /* 点击重置按钮，重置登陆表单 */
    resetLoginForm () {
      this.$refs.loginFormRef.resetFields()
    },
    //点击登陆按钮，进行验证
    login() {
      this.$refs.loginFormRef.validate(async valid=>{
        if(!valid) return;
        //{data:res}相当于只取出result里的data数据并赋值为res
        const { data: res } = await this.$http.post('login',this.loginForm);
        //判断它是否登陆成功
        if(res.meta.status !== 200) return this.$message.error('登陆失败');
        this.$message.success("登陆成功");
        /* 1将登陆成功之后的token保存在客户端的session中
           1.1项目中除了登录之外的其他API接口，必须在登录后访问
           1.2 token只应在当前网站打开期间生效，所以将token保存在sessionStorege中
           1.3 通过编程式导航跳转到后台主页，路由地址是/home
           */
          window.sessionStorage.setItem("token",res.data.token);
          this.$router.push('/home')
      });
    }
  }
}
</script>

<style lang="less" scoped="">
  .login_container{
    background-color: #2b4b6b;
    height: 100%;
  }
  .login_box{
  width: 450px;
  height: 300px;
  background-color: white;
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  }
  .avatar_box{
    height: 130px;
    width: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #bdd;
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: white;
    img {width: 100%;
    height: 100%;
    border-radius: 50%;
    background-color: #eee;
    }
  }
  .btns{display: flex;justify-content: flex-end;}
  .login_form{position: absolute;bottom: 0;width: 100%;padding: 20px;box-sizing: border-box;}
</style>
